[release-2.51.0] Cherrypick #28571 to release branch.

[tvalentyn]

This cherrypicks #28571 "Fix Vertex AI postcommit suite to run the tests only once" to release branch.

[tvalentyn]

R: @kennknowles

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[codecov]

Codecov Report

Merging #28658 (94adacd) into release-2.51.0 (22abcde) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           release-2.51.0   #28658      +/-   ##
==================================================
- Coverage           72.30%   72.22%   -0.08%     
==================================================
  Files                 684      684              
  Lines              101727   101071     -656     
==================================================
- Hits                73549    72999     -550     
+ Misses              26602    26496     -106     
  Partials             1576     1576              

Flag	Coverage Δ
python	82.80% <ø> (-0.02%)	⬇️

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see 11 files with indirect coverage changes

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[kennknowles]

Seems to have failed in administrative steps

Post job cleanup.
/usr/bin/tar --posix --use-compress-program zstdmt -cf cache.tzst --exclude cache.tzst -P -C /runner/_work/beam/beam --files-from manifest.txt
Warning: Failed to save: Cache service responded with 429 during upload chunk.
/runner/_work/_actions/actions/setup-java/v3.8.0/dist/cleanup/index.js:401
                        throw new Error(`Cache upload failed because file read failed with ${error.message}`);
                        ^

Error: Cache upload failed because file read failed with EBADF: bad file descriptor, read
    at ReadStream.<anonymous> (/runner/_work/_actions/actions/setup-java/v3.8.0/dist/cleanup/index.js:401:31)
    at ReadStream.emit (node:events:513:28)
    at emitErrorNT (node:internal/streams/destroy:157:8)
    at errorOrDestroy (node:internal/streams/destroy:220:7)
    at node:internal/fs/streams:262:9
    at FSReqCallback.wrapper [as oncomplete] (node:fs:671:5)

[kennknowles]

Re-running failed jobs again. Seeing quite a bit of flaking in the cherrypicks today.